CN104217684A - LED (light emitting diode) defective point processing method and detection method and LED display control method - Google Patents
LED (light emitting diode) defective point processing method and detection method and LED display control method Download PDFInfo
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- CN104217684A CN104217684A CN201410460531.9A CN201410460531A CN104217684A CN 104217684 A CN104217684 A CN 104217684A CN 201410460531 A CN201410460531 A CN 201410460531A CN 104217684 A CN104217684 A CN 104217684A
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Abstract
The invention relates to an LED (light emitting diode) defective point processing method, an LED defective point detection method and an LED display control method. The LED defective point processing method includes steps: controlling a plurality of LED lamp points in an LED display module to output appointed gray value so as to display a detection picture; analyzing a photograph obtained by shooting the detection picture so as to confirm positions of LED defective points in the plurality of the LED lamp points; transmitting the confirmed positions of the LED defective points to a display control system electrically connected with the LED display module, and therefore using video image data after being processed to drive and control the LED display module to display image data corresponding to LED pixel points where the LED defective points are located after the gray value of the image data is set to zero when the display control system processes the image data. The LED defective point processing method, the LED defective point detection method and the LED display control method do not need a person to manually restore a module where the LED defective points are located, and can greatly reduce maintenance cost and reduce operation difficulty in recovery processing of the LED defective points on the premise of guaranteeing display effects.
Description
Technical field
The present invention relates to LED display technique field, relate in particular to a kind of LED bad point disposal route, a kind of LED dead pixel detection method and a kind of LED display control method.
Background technology
Along with the lifting of LED manufacturing technology and LED display technique, the use of large scale LED display is very extensive, and some crowded places such as Cultural Square, street corner, station, market, hotel are all used LED display to carry out outdoor advertising displaying; Be mainly used in playing some oneself Discount Promotion advertisements, or the advertisement of other clients' inputs, for collecting some advertising fees.Abroad, the application market of LED display is also very wide.These display screens in use, along with growth, the LED lamp point of service time is aging, solder joint comes off, and there will be sparse LED bad point.
Because LED shows the characteristic of controlling, conventionally can cause near the lamp point light on and off of bad point abnormal.Conventionally we can see, certain region in LED display, due to the necrosis of a lamp point, can cause lamp point luminous intensity around and fluorescent lifetime to occur abnormal.
As shown in Figure 1, it is a kind of common LED lamp plate control circuit.Under normal circumstances, when control circuit lights LED1, because diode turn-on voltage is certain, make A point voltage VA=VD-Vf=VDD2-Vf (Vf is diode cut-off voltage).Now, although E point and F point voltage VE, VF is logic low, and actual is a uncontrollable voltage, while VE, VF must be less than VDD2, so (VE-VB), (VF-VC) must be less than Vf and make LED2, LED3 can conducting, just can not be luminous yet.But, if LED1 is due to aging or the lamp point generation bad point that comes off, make when LED1 is lighted in control circuit control, in control chip, because IN holds, be now logical zero, OUT1 end is also logical zero, and because LED1 does not have luminous in fact, so causing flowing through the electric current of LED1 is 0, VA is not drawn high to VDD2-Vf, remain logical zero, and E now, the voltage VE of F place, VF is uncontrollable, if VE, the difference of any one voltage of VF and OUT1 voltage be greater than Vf can cause LED2 or LED3 luminous, and LED2 now, the luminous intensity of LED3 (being also gray-scale value) is to be controlled by the gray-scale value of lamp point LED1, with respect to lamp point LED2, can there is a difference in the original luminous intensity of LED3, abnormal referred to herein as light on and off.
Traditional bad point disposal route comprises: a). by blowing hot wind, the lamp plate at bad point place is blown soft, the LED lamp point that LED bad point is removed and again changed, although this disposal route can be repaired bad point, but operation is trouble, consuming time very, simultaneously, if careless manipulation, may make workload increase; B). change the lamp plate (module) at LED bad point place, this disposal route causes replacement cost too high, meanwhile, and because lamp plate and other lamp plates after changing are not same batch, can destroy the light tone degree homogeneity of display screen, thereby need to again to display screen, enter line brightness/chrominance and proofread and correct; C). do not process, the light on and off of the LED bad point of leaving adjacent lamp point are abnormal.
Summary of the invention
Therefore, the embodiment of the present invention provides a kind of LED bad point disposal route, a kind of LED dead pixel detection method and a kind of LED display control method, it is abnormal that it can solve the demonstration that in prior art, display screen bad point causes, reduce display screen bad point maintenance difficulty, operability is strengthened, and reduce display screen bad point maintenance cost, the display life of lifting display screen.
Particularly, a kind of LED bad point disposal route that the embodiment of the present invention provides, it comprises step: a plurality of LED lamp point outputs of (s11) controlling in LED display module specify gray-scale value to detect picture to show; (s12) to taking the pictures taken that described detection picture obtains, carry out analyzing and processing to determine the position of the LED bad point in described a plurality of lamp point; And (S13) position of definite LED bad point is sent to the display control program being electrically connected to described LED display module, with by described display control program when processing vedio data by the LED pixel at LED bad point place after the gray-scale value zero setting of corresponding view data the vedio data of recycling after processing drive and control described LED display module and show.
In one embodiment of the invention, described step (s11) comprising: a plurality of the first color LED lamp point outputs of controlling in the described a plurality of LED lamp points in described LED display module specify gray-scale value to show the first color detection picture; And a plurality of the second color LED lamp point outputs of controlling in the described a plurality of LED lamp points in described LED display module specify gray-scale value to show the second color detection picture.
In one embodiment of the invention, above-mentioned appointment gray-scale value is the highest gray-scale value.
In one embodiment of the invention, in above-mentioned steps (s13), the gray-scale value zero setting of view data corresponding to the LED pixel at LED bad point place is comprised: by the light tone degree correction coefficient zero setting of the LED pixel at LED bad point place.
In addition, a kind of LED dead pixel detection method that the embodiment of the present invention provides, comprises step: a plurality of LED lamp point outputs of (s21) controlling in LED display module specify gray-scale value to detect picture to show; And (s22) to taking the pictures taken that described detection picture obtains, carry out analyzing and processing to determine the position of the LED bad point in described a plurality of LED lamp point.
In one embodiment of the invention, above-mentioned steps (s21) sequentially comprises: a plurality of the first color LED lamp points of controlling in the described a plurality of LED lamp points in described LED display module are exported described appointment gray-scale value to show the first color detection picture; And a plurality of the second color LED lamp points of controlling in the described a plurality of LED lamp points in described LED display module are exported described appointment gray-scale value to show the second color detection picture.
In one embodiment of the invention, above-mentioned appointment gray-scale value is the highest gray-scale value.
In one embodiment of the invention, above-mentioned steps (s21) comprising: the LED modules with different colors lamp point of controlling in the described a plurality of LED lamp points in described LED display module is all exported the highest gray-scale value to show pure color detection picture.
In addition, a kind of LED display control method that the embodiment of the present invention provides, is applied to have the LED display module of LED bad point, and it comprises step: (s31) obtain vedio data; (s32) by vedio data corresponding to the gray-scale value zero setting of the view data of the LED pixel at LED bad point place with the vedio data after being processed; And (s33) vedio data after utilize processing drives and controls described LED display module and show.
In one embodiment of the invention, in above-mentioned steps (s32), the gray-scale value zero setting corresponding to the view data of the pixel at LED bad point place in vedio data is comprised: by the light tone degree correction coefficient zero setting of the LED pixel at LED bad point place.
As from the foregoing, the embodiment of the present invention does not need artificially to repair bad point place module, can under the prerequisite that guarantees display effect, reduce greatly maintenance cost, can overcome owing to changing module and cause the good screen of bright uniformity of chromaticity homogeneity after maintenance to occur declining, can reduce the operation easier of bad point repair process.
By the detailed description below with reference to accompanying drawing, it is obvious that other side of the present invention and feature become.But it should be known that the only object design for explaining of this accompanying drawing, rather than as the restriction of scope of the present invention, this is because it should be with reference to additional claim.Should also be appreciated that, unless otherwise noted, the unnecessary accompanying drawing of drawing to scale, they only try hard to illustrate conceptually structure described herein and flow process.
Accompanying drawing explanation
Fig. 1 is a kind of common LED lamp plate control circuit schematic diagram.
Fig. 2 is a kind of LED bad point disposal system Organization Chart of the embodiment of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Refer to Fig. 2, its a kind of LED bad point disposal system Organization Chart that is the embodiment of the present invention.As shown in Figure 2, operating personnel set up the connection between the display control program 25 in bad point detection equipment 21 and LED display device, and it can be wired connection, can be also such as WIFI or 3G etc. of wireless connections.In addition,, in LED display device, LED display 23 and display control program 25 form and are electrically connected to; At this, LED display 23 is given an example as a kind of of LED display module, and it can be double-colored screen or full-color screen; Display control program 25 can be LED display synchronous control system or LED display asynchronous control system, and it can be processed and utilize processing rear video view data to drive control LED display 23 to show vedio data.More specifically, LED display synchronous control system for example comprises broadcasting computing machine, sending card and the receiving card being sequentially electrically connected to, and perhaps some LED display synchronous control system does not arrange sending card and be often referred to as without sending card LED display synchronous control system; LED display asynchronous control system for example comprises asynchronous control card, and some even also disposes receiving card.
Hold above-mentionedly, the LED bad point disposal route of the present embodiment specifically can be realized by following steps:
First, user opens process software, the detection picture that LED display 23 is shown is taken pictures, for example sequentially red, green, blue three looks being detected to picture takes, then to taking the picture obtain, carry out respectively image analysis processing, obtain in LED display 23 position of red, green, blue LED bad point in each monochromatic situation.
Then, LED bad point position is uploaded to the display control program 25 being electrically connected to LED display 23, for example send the sending card in display control program 25 to, sending card receives after the coordinate data of LED bad point, the vedio data receiving is being carried out in processing procedure, when exporting each frame image data, the gray-scale value of the view data that the LED pixel at LED bad point place is corresponding is set to 0, control the output current zero setting of each color LED in this pixel, the method that can adopt is: by regulating the light tone degree correction coefficient of each color LED lamp point in this pixel to complete, for example the light tone degree correction coefficient of each color LED lamp point in this pixel is set to zero, like this no matter which type of current value of input, its output is zero.View data so after treatment outputs to LED display 23 and just there will not be light on and off abnormal when showing.At this, it is worth mentioning that, take R, G, B three primary colours full-color LED display screen is example, single led pixel comprises at least one redness, at least one is green and at least one blue led lamp point, when any one lamp point is wherein bad point, the gray-scale value that the LED lamp of all kinds in whole LED pixel is put corresponding view data all can be set to 0, is also that the gray-scale value of the view data that aforesaid LED pixel is corresponding is set to 0.
For ease of more clearly understanding the present invention, below in conjunction with Fig. 1, the principle that realizes of the embodiment of the present invention is described:
As shown in Figure 1, it is a kind of common LED lamp plate control circuit.Under normal circumstances, when control circuit makes lamp point LED1 light according to certain luminous intensity (gray-scale value), the output pin output level that LED1 is corresponding is a high level VDD2, and an OUT1 end output PWM relevant with gray-scale value (can modulate width-pulse ripple) signal makes lamp point LED1 send one and specifies light intensity corresponding to gray-scale value.
In diode current flow, because diode turn-on voltage is certain, make A point voltage VA=VD-Vf=VDD2-Vf (Vf is diode cut-off voltage).Now, although E point and F point voltage VE, VF is logic low, and actual is a uncontrollable voltage, while VE, VF must be less than VDD2, so (VE-VB), (VF-VC) must be less than Vf and make lamp point LED2, LED3 can conducting, just can not be luminous yet.But, if lamp point LED1 is due to aging or the lamp point generation bad point that comes off, make when control circuit control LED1 lamp is bright, in control chip, because IN holds, be now logical zero, OUT1 end is also logical zero, and because LED1 does not have luminous in fact, so causing flowing through the electric current of LED1 is 0, VA is not drawn high to VDD2-Vf, remain logical zero, and E now, the voltage VE of F place, VF is uncontrollable, if E, the difference of the voltage of F any point and OUT1 terminal voltage is greater than Vf, will cause LED2 or LED3 luminous, and LED2 now, the luminous intensity of LED3, namely gray-scale value is to be controlled by the gray-scale value of LED1, with respect to LED2, can there is a difference in the original luminous intensity of LED3, abnormal referred to herein as light on and off.
By the present inventor, analyze and test discovery: when LED1 bad point disconnects, if controlled again, light LED1 and conventionally can cause LED2 or LED3 extremely to light, in actual displayed process, can cause LED2, the luminous intensity of LED3 is abnormal; If the gray-scale value that now LED1 is corresponding is set to 0, namely controlling LED1 does not allow it bright, because IN end is input as logical one, OUT1 end is output as a logic high, VA so, VB, VC is high level, (VE-VB) and (VF-VC) must be less than Vf, just not light on and off extremely of LED2 and LED3 so.
In addition, in bad point detection process, because be, control LED display 23 sequentially to show that red, green, blue three looks detect picture and measure respectively; And, during each measurement, the gray-scale value of each LED lamp points output of LED display 23 is controlled as the highest gray-scale value for example 255, although so now may cause can causing LED2 when LED1 is lighted in control, LED3 lamp is bright, but gray-scale value is all 255, while taking pictures, be not see LED2, LED3 has glittering abnormal; So do not affect software take pictures location bad point position.In addition, be understandable that, also output gray level value all can be lighted and set to the red, green, blue three-color LED light point in LED display 23 and be 255, it can reach the object of bad point detection equally, and can reduce measurement number of times.Moreover, be understandable that, although in aforementioned bad point detection process, to set the highest gray-scale value of LED lamp point output, but it will be understood by those skilled in the art that, in testing process, the setting of LED lamp point output gray level value is not limited to the highest gray-scale value, also can suitably reduce, only otherwise can affect the software bad point position, location of taking pictures.
In sum, the above embodiment of the present invention does not need artificially to repair bad point place module, can under the prerequisite that guarantees display effect, reduce greatly maintenance cost, because for a larger-size LED display, its LED lamp is counted up to ten thousand at least, hundreds of thousands～millions of at most if the physical distance of bad point does not have the light on and off of lamp point around abnormal more greatly, simultaneously, does not affect user's viewing effect in actual displayed effect.In addition, can overcome owing to changing module (lamp plate) and cause the good display screen of bright uniformity of chromaticity homogeneity after maintenance to occur declining.In addition, can also reduce the operation easier of bad point repair process.
Applied specific case herein principle and the embodiment of LED bad point disposal route of the present invention, LED dead pixel detection method and LED display control method are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention; all will change in specific embodiments and applications; in sum, this description should not be construed as limitation of the present invention, and protection scope of the present invention should be as the criterion with appended claim.
Claims (10)
1. a LED bad point disposal route, is characterized in that, comprises step:
(x1) a plurality of LED lamp point outputs of controlling in LED display module specify gray-scale value to detect picture to show;
(x2) to taking the pictures taken that described detection picture obtains, carry out analyzing and processing to determine the position of the LED bad point in described a plurality of LED lamp point; And
(x3) position of definite LED bad point is sent to the display control program being electrically connected to described LED display module, with the vedio data when processing vedio data, the LED pixel at LED bad point place being recycled after the gray-scale value zero setting of corresponding view data after processing by described display control program, drives the described LED display module of control to show.
2. LED bad point disposal route as claimed in claim 1, is characterized in that, described step (x1) comprising:
A plurality of the first color LED lamp points of controlling in the described a plurality of LED lamp points in described LED display module are exported described appointment gray-scale value to show the first color detection picture; And
A plurality of the second color LED lamp points of controlling in the described a plurality of LED lamp points in described LED display module are exported described appointment gray-scale value to show the second color detection picture.
3. LED bad point disposal route as claimed in claim 1, is characterized in that, described appointment gray-scale value is the highest gray-scale value.
4. LED bad point disposal route as claimed in claim 1, it is characterized in that, in described step (x3), the gray-scale value zero setting of view data corresponding to the LED pixel at LED bad point place is comprised: by the light tone degree correction coefficient zero setting of the LED pixel at LED bad point place.
5. a LED dead pixel detection method, is characterized in that, comprises step:
(y1) a plurality of LED lamp point outputs of controlling in LED display module specify gray-scale value to detect picture to show; And
(y2) to taking the pictures taken that described detection picture obtains, carry out analyzing and processing to determine the position of the LED bad point in described a plurality of LED lamp point.
6. LED dead pixel detection method as claimed in claim 5, is characterized in that, described step (y1) sequentially comprises:
A plurality of the first color LED lamp points of controlling in the described a plurality of LED lamp points in described LED display module are exported described appointment gray-scale value to show the first color detection picture; And
A plurality of the second color LED lamp points of controlling in the described a plurality of LED lamp points in described LED display module are exported described appointment gray-scale value to show the second color detection picture.
7. LED dead pixel detection method as claimed in claim 5, is characterized in that, described appointment gray-scale value is the highest gray-scale value.
8. LED dead pixel detection method as claimed in claim 5, is characterized in that, described step (y1) comprising:
A plurality of LED modules with different colors lamp points of controlling in the described a plurality of LED lamp points in described LED display module are all exported the highest gray-scale value to show pure color detection picture.
9. a LED display control method, is applied to have the LED display module of LED bad point; It is characterized in that, described LED display control method comprises step:
(z1) obtain vedio data;
(z2) by vedio data corresponding to the gray-scale value zero setting of the view data of the LED pixel at LED bad point place with the vedio data after being processed; And
(z3) utilize the vedio data after processing to drive the described LED display module of control to show.
10. LED display control method as claimed in claim 9, it is characterized in that, in described step (z2), the gray-scale value zero setting corresponding to the view data of the LED pixel at LED bad point place in vedio data is comprised: by the light tone degree correction coefficient zero setting of the LED pixel at LED bad point place.
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| CN113297923A (en) * | 2021-04-30 | 2021-08-24 | 西安诺瓦星云科技股份有限公司 | Display screen monitoring method, device and system and embedded processor |
| CN114049861A (en) * | 2021-11-16 | 2022-02-15 | 北京集创北方科技股份有限公司 | LED display screen control method, device, equipment and system |
| CN116049863A (en) * | 2023-03-28 | 2023-05-02 | 东莞锐视光电科技有限公司 | System, method and application for generating stripe light by LCD display screen |
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